NPE

ON-BOARD

MICROPROCESSOR

PORT

I/O

CIRCUIT

GROUND

DETECTOR

PORT

CIRCUIT

0

I

I

I

I

I

PORT

CIRCUIT

3

\

T.O

R.O

S.0

S1.0

SZ.0

SZ1.0

T.3

R.3

S.3

S1.3

SZ.3

SZ1.3

/

TO

AUXILIARY

EQUIPMENT

Figure 3-18. Unique Auxiliary Trunk (TN763) Circuitry

3-36

Page 320
Image 320
AT&T AT&T manual Unique Auxiliary Trunk TN763 Circuitry